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WILLIAM HAILES AND PETER FiNKLE, or ALBANY, NEW YORK, ASSIGN- ons To Pump vFurnier.A r A Ltterspatmlvo. 68,738, ma .sapiente ilojlson A vDAMPnn Fon stove riens'.

Beit known that we, WILLIAM HAInEs and PETER FINKLE, of the city of Albany, State of New York, i

have jointly invented a new and useful Damper for the regulation of the draught in the pipe, flue, Aor chimney of stoves or furnaces, which we call the Self-Acting Rotary Damper, of which the following specification, with" i the drawings forming part thereof, is a full and complete description.

Figure 1 represents the damper in front, and Figure 2 in end view.V Similar letters denote the same parte of the apparatus. A is arng of metahwhose exterior periphery is to be ofthe proper size to fit the diameter ofthe pipe or line whose draught is to b'e regulated, so as to turn .freely within it, (in the manner of ordinary disk dampers,) revolving upon axes B and C, and operated by the thumb-piece D, an extension of the axis B, in the usualway. W'ithin the ring A. is inwind-wheel fitted to revolve'fsnugly but freely, being a set of oblique Wings, E, attached 'to a, central boss, through which passes its axis, "which it is suspended to hars' crossing 'thecentral diameter-A ofthe ring on each side, one ofwhich is shown at4 G'. The outer ends of' these wings, as we construct them,1

and as is shown, are secured to or form part oi'ja thin-4 ring, J; the boss,A Wings, and ring being cast together. The Wings are to be set at such angle or pitch as, may he fond expedient in practical use.

The operation of the demper is obvious. When an entire free draught is desiredhit is turned edgewise'in theV pipe or flue. When the draught is to be checked the damper isclosed across the pipe. A` When this is done, theA A wind-wheel begins to revolve, and soon moves with a. rapidity proportional to the velocity of the current of air in the pipe, which at first will be very rapid. The e'ect of the passage of the nir as deiiccted through the 5 y wings', combined with its movement alongthe pipe, causes the' currents so to cross and mingle as to check theirA i direct movementthrough the pipe in directproportion to the velocity of the wheel, that is, to the quantity of hot air passing through the flue. By this the drsiughtis gradually checked until it is so faxreduced as to pass A off the gaseous fumes alone and still keep the i'uelractive.

To4 use the ordinary disk damper properly it is necessary to close it by hand `gradually inorder to prevent the escape of gas fromthe stove or furnace, which would occur by shutting the damper too close at first. This is a. trouhlesomeoperntion, which the revolving damper-gradually performs by its self-acting operation. i i

Another beneficial` feature is that thermovementof the wings, with their currents of air, prevents the 'accretion of snot upon the damper, with its injurious consequences. i

What we claim as our invention, and desire 'to secure by Letters Patent, is-

The construction and application of a damper in the form of a. Wind-wheel with oblique wings fitted to revolve within the pipe, flue, or chimney of a. stove or furnace, substantially as describedand fout-he purposes set forth. A l WILLIAM-.HAILES,A

PETER FINKLE.

Witnesses:

RIGHD. VARICK De WITT, D. W. DE WITT. 

